We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Five small cylindrical ceramic fuses with silver end caps

Bussmann

Bussmann S505-4-R Ceramic Fuse 4A 250V AC 1.5kA 5 PK line protection

SKU CH-AC5Z-8641Q

Pack of five 4 A ceramic time-delay fuses rated 250 V AC with 1.5 kA interrupt capacity

  • Time-delay operation protects against nuisance tripping
  • 5 kA interrupt rating at 250 V AC handles fault currents
  • Ceramic body provides reliable insulation and durability
  • 20 mm × 5 mm cylindrical size fits standard fuse blocks
  • Pack of five ensures spares for maintenance

EATON BUSSMANN S505 4A ceramic fuse 5-pack

The EATON BUSSMANN S505 series ceramic fuse provides 4 A time-delay protection at 250 V AC with a 1.5 kA interrupt rating. Each cylindrical fuse measures 20 mm by 5 mm and carries BSI, CCC, CSA, IMQ, SEMKO, UL and VDE approvals. A pack contains five non-indicating, non-rejection fuses compatible with HTB fuse blocks.

Suits low-current AC line protection not

These fuses suit low-current AC line protection where a time-delay characteristic prevents nuisance opening on inrush. They are not for high-energy DC circuits, semiconductor protection or applications that require a filled-tube or high-breaking-capacity fuse. Buyers who need visual indication, a rejection-style body or a higher interrupt rating should select a different series.

1.5 kA interrupt rating at 250 V AC decides fit

The single specification that decides fit is the 1.5 kA interrupt rating at 250 V AC; the circuit's prospective short-circuit current must stay below this value. If the available fault current exceeds 1.5 kA, the fuse cannot safely clear the fault and a higher-rated device is required.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 83% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

Does the 4 A ceramic fuse need periodic replacement even if it has not blown?

No scheduled replacement is required; the fuse remains in service until an over-current event opens the element.

What stops the fuse from carrying current continuously at its 4 A rating?

The time-delay element tolerates brief surges but will melt if the 4 A load persists beyond its thermal limit.

How much heat does a single 20 mm × 5 mm fuse generate when running at 4 A all day?

Power loss is low at rated current; the ceramic body dissipates the small wattage without forced cooling.

More in Breakers & Circuit Protection

Similar items